A urinary tract infection, or UTI, is an infection in the urinary tract. Infections are caused by microbes, including bacteria, fungi and viruses. Microbes are organisms too small to be seen without a microscope.
Infections of the urinary tract are the second most common type of infection in the body. If you think you have a UTI, it is important to see your doctor.
This reference summary explains the causes and symptoms of urinary tract infections, and the treatment options for urinary tract infections.